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Notice the amazing similarity between Mount St. Helen's and Mount Pinatubo ashes. And they are from opposite sides of the planet! Yet a common commercial material in North America, Navajo Pumice, is completely different.
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Volcanic Ash
Powdered volcanic ash is used to make ceramic glazes, some varieties have a chemistry similar enough to glaze that high percentages can be employed. |
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Volcanic Ash 2
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